Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2
The recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in TaAs it has proven challenging to study the rich transport phenomena arising from emergent Weyl fermions. The series MoxW1...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2018
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| Online Access: | https://hdl.handle.net/10356/89785 http://hdl.handle.net/10220/47162 |
| _version_ | 1826129559039246336 |
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| author | Yu, Peng Pan, Xingchen Belopolski, Ilya Sanchez, Daniel S. Ishida, Yukiaki Xu, Su-Yang Chang, Guoqing Chang, Tay-Rong Zheng, Hao Alidoust, Nasser Bian, Guang Neupane, Madhab Huang, Shin-Ming Lee, Chi-Cheng Song, You Bu, Haijun Wang, Guanghou Li, Shisheng Eda, Goki Jeng, Horng-Tay Kondo, Takeshi Lin, Hsin Liu, Zheng Song, Fengqi Shin, Shik Hasan, M. Zahid |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Yu, Peng Pan, Xingchen Belopolski, Ilya Sanchez, Daniel S. Ishida, Yukiaki Xu, Su-Yang Chang, Guoqing Chang, Tay-Rong Zheng, Hao Alidoust, Nasser Bian, Guang Neupane, Madhab Huang, Shin-Ming Lee, Chi-Cheng Song, You Bu, Haijun Wang, Guanghou Li, Shisheng Eda, Goki Jeng, Horng-Tay Kondo, Takeshi Lin, Hsin Liu, Zheng Song, Fengqi Shin, Shik Hasan, M. Zahid |
| author_sort | Yu, Peng |
| collection | NTU |
| description | The recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in TaAs it has proven challenging to study the rich transport phenomena arising from emergent Weyl fermions. The series MoxW1−xTe2 are inversion-breaking, layered, tunable semimetals already under study as a promising platform for new electronics and recently proposed to host Type II, or strongly Lorentz-violating, Weyl fermions. Here we report the discovery of a Weyl semimetal in MoxW1−xTe2 at x=25%. We use pump-probe angle-resolved photoemission spectroscopy (pump-probe ARPES) to directly observe a topological Fermi arc above the Fermi level, demonstrating a Weyl semimetal. The excellent agreement with calculation suggests that MoxW1−xTe2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making MoxW1−xTe2 a promising platform for transport and optics experiments on Weyl semimetals. |
| first_indexed | 2024-10-01T07:42:34Z |
| format | Journal Article |
| id | ntu-10356/89785 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:42:34Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/897852023-07-14T15:51:46Z Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2 Yu, Peng Pan, Xingchen Belopolski, Ilya Sanchez, Daniel S. Ishida, Yukiaki Xu, Su-Yang Chang, Guoqing Chang, Tay-Rong Zheng, Hao Alidoust, Nasser Bian, Guang Neupane, Madhab Huang, Shin-Ming Lee, Chi-Cheng Song, You Bu, Haijun Wang, Guanghou Li, Shisheng Eda, Goki Jeng, Horng-Tay Kondo, Takeshi Lin, Hsin Liu, Zheng Song, Fengqi Shin, Shik Hasan, M. Zahid School of Electrical and Electronic Engineering School of Materials Science & Engineering Centre for Programmable Materials Nanoelectronics Centre of Excellence DRNTU::Engineering::Materials Electronic Properties and Materials Topological Matter The recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in TaAs it has proven challenging to study the rich transport phenomena arising from emergent Weyl fermions. The series MoxW1−xTe2 are inversion-breaking, layered, tunable semimetals already under study as a promising platform for new electronics and recently proposed to host Type II, or strongly Lorentz-violating, Weyl fermions. Here we report the discovery of a Weyl semimetal in MoxW1−xTe2 at x=25%. We use pump-probe angle-resolved photoemission spectroscopy (pump-probe ARPES) to directly observe a topological Fermi arc above the Fermi level, demonstrating a Weyl semimetal. The excellent agreement with calculation suggests that MoxW1−xTe2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making MoxW1−xTe2 a promising platform for transport and optics experiments on Weyl semimetals. NRF (Natl Research Foundation, S’pore) Published version 2018-12-21T04:25:55Z 2019-12-06T17:33:26Z 2018-12-21T04:25:55Z 2019-12-06T17:33:26Z 2016 Journal Article Belopolski, I., Sanchez, D. S., Ishida, Y., Pan, X., Yu, P., Xu, S.-Y., . . . Hasan, M. Z. (2016). Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2. Nature Communications, 7, 13643-. doi:10.1038/ncomms13643 https://hdl.handle.net/10356/89785 http://hdl.handle.net/10220/47162 10.1038/ncomms13643 en Nature Communications © 2016 The Author(s) (Published by Nature Publishing Group). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. 9 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials Electronic Properties and Materials Topological Matter Yu, Peng Pan, Xingchen Belopolski, Ilya Sanchez, Daniel S. Ishida, Yukiaki Xu, Su-Yang Chang, Guoqing Chang, Tay-Rong Zheng, Hao Alidoust, Nasser Bian, Guang Neupane, Madhab Huang, Shin-Ming Lee, Chi-Cheng Song, You Bu, Haijun Wang, Guanghou Li, Shisheng Eda, Goki Jeng, Horng-Tay Kondo, Takeshi Lin, Hsin Liu, Zheng Song, Fengqi Shin, Shik Hasan, M. Zahid Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2 |
| title | Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2 |
| title_full | Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2 |
| title_fullStr | Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2 |
| title_full_unstemmed | Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2 |
| title_short | Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2 |
| title_sort | discovery of a new type of topological weyl fermion semimetal state in mo x w1 xte2 |
| topic | DRNTU::Engineering::Materials Electronic Properties and Materials Topological Matter |
| url | https://hdl.handle.net/10356/89785 http://hdl.handle.net/10220/47162 |
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